steel beam connection 
https://onlinebeam.co.uk 
Structural Calcs for Building Control Steel Beam Connections Design Box Frame, Flitch Beam, Beam Plate, Steel Beam Calculations for Building Control
    
 steel beam connection 
https://onlinebeam.co.uk 
Structural Calcs for Building Control Steel Beam Connections Design Box Frame, Flitch Beam, Beam Plate, Steel Beam Calculations for Building Control